Boost Converter Enable Battery Longevity

ROHM’s BU33UV7NUX boost dc/dc converter with built-in MOSFET claims to exhibit the lowest current consumption in the industry. The device outputs the 3.3V necessary for driving MCUs in applications requiring 1V to 3V input from one to dry-cell batteries. Current consumption is 7 µA, extending operating time by as much as 175 days over conventional products, from 540 days to 715 days (ROHM study, 50 µA load current and assuming standby operation in conventional remote controls driven by two alkaline batteries). In addition, a load current mode switching function is built in that allows existing remote controls to support the latest high-performance systems equipped with LCD panels, providing greater energy savings in a wide range of sets.


Low Current

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To prolong operating life with dry-cell batteries, ROHM leveraged original analogy design technologies and power system processes to achieve a current consumption of just 7 µA, the smallest in the industry among functionally equivalent products. This makes it possible to increase battery life in conventional remote controls powered by two alkaline dry-cell batteries by approx. 1.3x over existing solutions, providing an extra 175 days of operation (ROHM study, assuming standby mode and a load current of 50 µA). In addition, the BU33UV7NUX can be driven by input voltages as low as 0.9V and supports both single dry-cell and button-type lithium-ion battery sets. Plus, the built-in battery leak detection function makes it particularly suited for dry-cell applications.


Load Current Mode Switching Improves Efficiency


A load current mode switching function is included that allows existing remote controls to support the latest high-performance LCD-equipped sets while delivering superior energy savings. Adopting a low-power mode for standard products (50 mA max. load current, 7 µA current consumption, PFM control), and automatically switching to high-power mode for high-performance (500 mA max. load current, 13 µA current consumption, PFM/PWM switching control), make it possible to achieve high efficiency power conversion as high as 94% under a wide range of conditions.


 Price for the BU33UV7NUX is $0.49 each/1,000. The BU33UV7NUX-EVK-101 costs $51.25 per board. For more gratifying details and specs, take stock of a BU33UV7NUX datasheet and don’t forget to learn more about the evaluation board.


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